AirHint found the following cheapest return flights from Zurich (ZRH) to Sofia (SOF) in December 2025 (see full year).

Return flights

04 Dec - 08 Dec	Vueling Airlines
04 Dec - 08 Dec	SWISS	direct
28 Dec - 02 Jan	SWISS
28 Dec - 04 Jan	SWISS
21 Dec - 05 Jan	Air Serbia
27 Dec - 03 Jan	Air Serbia
22 Dec - 03 Jan	Air Serbia
21 Dec - 04 Jan	Air Serbia
20 Dec - 04 Jan	Air Serbia
21 Dec - 05 Jan	SWISS	direct
21 Dec - 04 Jan	SWISS	direct

Also check the deals for one-way flights from Zurich to Sofia in December.

The deals are updated regularly. The prices may go up as tickets are purchased by other travellers. Only the cheapest flights are offered. Select a price to book and secure these cheap prices.

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Cheapest return flights from Zurich to Sofia in December from 166€

Return flights